Diesel engines lack which components that are common in many gasoline engines?

Diesel engines lack which components that are common in many gasoline engines?

• A. Spark plugs
• B. Turbocharger
• C. Carburetor and electrical ignition system
• D. Fuel injectors

Answer: (D)

Diesel engines rely on compression ignition and direct fuel injection, not on a carburetor or a spark-ignition electrical system. In gasoline engines, fuel and air are often mixed in a carburetor (or metered by electronic fuel injectors) and the mixture is ignited by spark plugs. Diesel engines, by contrast, compress air to a high temperature and inject fuel directly into the cylinder so it ignites from the heat of compression. Because of this, the components tied to gasoline ignition and metering—a carburetor and an electrical ignition system—are not used in diesels. Diesel engines do use fuel injectors, though, and they may use glow plugs for starting, rather than spark plugs.

Diesel engines rely on compression ignition and direct fuel injection, not on a carburetor or a spark-ignition electrical system. In gasoline engines, fuel and air are often mixed in a carburetor (or metered by electronic fuel injectors) and the mixture is ignited by spark plugs. Diesel engines, by contrast, compress air to a high temperature and inject fuel directly into the cylinder so it ignites from the heat of compression. Because of this, the components tied to gasoline ignition and metering—a carburetor and an electrical ignition system—are not used in diesels. Diesel engines do use fuel injectors, though, and they may use glow plugs for starting, rather than spark plugs.